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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9970dfad29fac0e61c2108e88aa3187cd60618ee982d45b921825ee8acf246b3' 
  AND token = '1K0KHEznrgi98gcQzrW7ifh3i0fJE0o569m/FFxwJCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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