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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12631ee60e79139b8624bd4b6b65aadde0638d517161cdb7f276ca50afa52d2' 
  AND token = 'p0WB+06JaT8tSSFe2LhTFGL4cDw6cuxV9IIc0K5qf+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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