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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c448f6a0de9fff66cc12863890e6e36677779538928560b7c7849e5d49904615' 
  AND token = 'kplfJW2h8/tJA2tEl+emelMiRcl1/8TT/Fvfb6XwTU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}