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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13298e3c7fd67cffd0e9021ca93b9caf1950035ceaaff5747d286ac84288e073' 
  AND token = 'oYbd6YEMORZFdjdV8Ltf7aK7US20rKS/llB9Ea2WXJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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