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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637496b7285678d63701bcdc6557a643d1d433d5179768667eb32e1d2561d90b' 
  AND token = 'iJNOvktBYcBomRGT6Q75s6ZH0/ucx3XW4o5UZGhROak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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