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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68eee87d5f2f198f9c0ed0ac96ea35fd986a4ae435e42d9cc568b2234407b307' 
  AND token = 'bxq1J9QmFbGsuzE/YrdenOgp5bD13UZtiJn7zAN96UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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