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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5b5b4306960179adf35ac914376e0602cf07158df1e068fd32432d46b4f663' 
  AND token = 'RjJ/3lJ3FErX3krICWCVO/AELAvFxKKnaEfBe3VEw7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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