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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45becabce9267812eb4d965cb331f868713bb33675d394ba2ee61d7275189bd7' 
  AND token = '0nsSbMTFmTe0mDM2yQ80jRd7lbSKG2kSfXSx0J8UPRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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