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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231e61e82fdce0a2091493ce5e74b097c68bf7fcc2025616fc61a11b8e3a4a9e' 
  AND token = 'R4vGC4fNiYrjDdIa1tymRYejUm5SlRLABUwzg7psTCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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