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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f570b7132e2d8f4b2ec140bfc4712f3cd40f04b42cf1fc02f3559f7d29fc11d' 
  AND token = '4iMHbn4OoFFrFQIctBY3EnxEJd12tMQyS/u4TDExaNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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