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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb56c7bfbf6439d9de08e1e339443a7519ae5357d3324c5ca957aae3a1c790a' 
  AND token = 's6XwCy6Ii/SU3AYBck2MDHj4AShNi/cqmraoQ2GT/04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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