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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd705f7d3931d4d8657a9d4f4ae266c9699be606a3212230cd7ed78f44d751e94' 
  AND token = 'IzbISGra8xACeelxRfWLyZTol2WWjlzUC1p0hRqHdCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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