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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebb89f09187f45bcb0e129fd6c594edde3d670a848007645c4a8d778e9f5389' 
  AND token = 'a7/UQAFYHoSnK/mV+3xxYnJ7DJHeNZ24kyohD15cXfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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