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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62e35a500f3a54bdfd747e10c0ec32df4a8b59c167257db1acbc47b0a4797de' 
  AND token = 'mFNlw52ALGBdvlkiRoiJ9RLKMMlMPL5ZMqasgX04l/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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