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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7955356617ea11e447b3f60bd54c326fb85335e6d27b6aca9562d16360318e' 
  AND token = 'SUoCYssoZ/ktVgc8f9eaG9JJ067x2PDHMoUHn5JzQKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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