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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c422ab0a07161d44c3189107234c21fd4d3a250607a55c6a80f065cf8b765a' 
  AND token = 'Ofu3Xudvu2M2Ej7kCKTQrlF9kGrV+2X0nVppcNBD898=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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