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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860b1c4806c484ec84319c2ba644848c6ad4cc878d2f0b0db60473c036e7b36a' 
  AND token = '4mkWE7h0627+a1YrfCiqGrokgywgwhu4VIURwvjD8Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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