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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737a39430410700d66fa753e7a259a1b4adf39b79b36fc9e19c1ba17da3a2cd0' 
  AND token = '2rTVfH8dbOhYZwL/Vlm/bGc5p+9+rKBOvddVXV6eS6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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