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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d55cccedb94c8c046e40ee7586b3331623edc516b2d3e2e251d1881a3a6438d' 
  AND token = 'WlWoHDI0Lsbdgum+9FNgP71S+swdj/E6akjomMycd5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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