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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76548fbb237575ca942ff6aabdbb0bd8d9194317ddea843ef5d328bc13f607c' 
  AND token = '8da7MKxWUvO9BjDZF1BergTHCqq7/sdEW3k6vXzoO0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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