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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68292112ef42b7f6b56b00785f66f3755d3ea2f0eb28d756ddc53f46efe6f51d' 
  AND token = 'un+uTYr7hBZbPhZjxtJHfqT7ov3j2Lud7PY1ryD/7/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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