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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6204e718404d94fd517b0c5080a433f2611eaf00ff4de4985399b76c280057ac' 
  AND token = 'jXy+qUzSVzD45xkOl+hal5Iu6Xk4/4rq9st+GhHxjWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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