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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c41566fd67cc97011e47e93a81055bbdc6ae81e7f41d61df7b707be09eb5e2a' 
  AND token = '0JoOjsF9JZ5pZEEDkqxmkse+d+Ijn/doFTjO0/T7sZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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