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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4048927d9952c72840a286a4f571b0ab832b92a5414d5b5db48d384416685a' 
  AND token = 'GNCzffxTo5BIvfFTLXNaXfaknqXPnEg1hv8zgMqjhCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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