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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223b51ab8acd2f871e79a6b20340b7349cb19fe18801f4827cdd02bf13364cc3' 
  AND token = 'LZIRLaoCJxtPTbIzEPgCdf3ObM/32IPGwIY+rcjY3ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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