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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3657a1c507ec630fa2df116faa7194df9655c2e0ee583d653814a94877039c' 
  AND token = 'ElqEPBDL+h8cM/H5esSl17qi2+ObjXtZ398eqfCyrZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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