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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b175c7ab433343590978ce5a1dc822056e8990bfba5b479d2c30e7085f37b8' 
  AND token = 'BZl4aj/J5zkQ9n0Z5tpxDig/+xmlxsw/QNHil7QwBJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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