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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1392ae2b6c56ce00afe458f48080b77745f382da5ca48d87e5d2c2ad356964' 
  AND token = '2R1XKrq8PBJlLgythm1JZn3mUQ8yQr8/x4aGSR8GPkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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