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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba73a0b4b0000b461ec56af8efebf19f4fd0d33e7086b6f08265918dce3fe2f4' 
  AND token = 'XSuMkhhmyrf/Gaqk2zgiN58s9p7OUQQBUt+CqXGKNR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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