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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d954af518c3e4e7c7ea858a86bc6cf53bc282c5dc739749284f0967abb057e2' 
  AND token = 'q3uE613MWdngo75/9uY8Euuc6f2grb4aS78I8eNFbbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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