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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb80fe29bbf5a995409bae0c9e47f6259f7534c18ccbc54e7c2fdeb58e0a1265' 
  AND token = '6P33Ck32BOHxmJxe/gA8M3KSdAzzpsTcHir1DK9MD8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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