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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea5c77bc4a3ce9e40952c8b32eb7b8cdd8ddc35b11bd43aafdd2d2cf0c27043' 
  AND token = 'ee87gWEJNx1vnC3aCOHLDEAVeqPz2JqPo5W/YZ3kJYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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