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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ae5f87cd2dc8dc57afefe5be46042233878f4178cc99945a76edac86dc3690' 
  AND token = 'oc1GuVagrmPj5mU/GteCZ5PwDTqyvYTaffqt/R3EKew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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