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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce761d264af25a56d993731f41df1d7ce29bb6a624076de2763c5af4c89d6bdf' 
  AND token = 'PgTmTjelCDcZdrHXp3Rosag6a9U5AdL5PkDYNGILFJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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