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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4a5bcb017b0e4ea435b8961644a8531ecabdcd2621e3afc03fdfeeab67ef9c' 
  AND token = 'baat5zLwAh6d+OVO7SWQ+FLN9PeUKgSqRe7gKbcfO+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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