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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf20f18fc69f0ce19c2415b18a0bcbea18b8182bfbe90e118da8ab46da7c5cc' 
  AND token = '/Hi1lzu60nk0JlIaWZeRnOG1Mt+VT1S4nGDaZaun1hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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