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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a46c084a3f9ee41a5252beefd414185ce8eff3dd868cbe71eaa364164cc4c30' 
  AND token = 'IlsqXnEaRyXfeY44THBCvTBDJSRv+yuCZEA66NH/jvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00936

JSON explain

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