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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3889073fd9e8f7173de32bc36d0e63b251b6c06f8f52b78c2402e16ae66fa0' 
  AND token = '9b5xS6oMcvfKXegcesrYxJKQ+NXprTbSsBPlxN3CzXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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