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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ffe30f29a3b91db4abd11f763b1e51db8073b4c695c19bc819cda75dbc6c5a' 
  AND token = 'YM4fDuRs0r7Hwg26vAfmgJ9Fm74ralo6JaOp68the7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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