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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7433facdea2d762b526b269ca51608b935232b99587f9650ee4d0f0304745b1c' 
  AND token = 'fZuyCpvfRAUj2ySz0cJ8slJfLA/LmgomcTltQpsNRYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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