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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf39ef00bf5159becb87580ecb58e4b9c4d8e9a052d4b0a2c1167473f350d21' 
  AND token = 'EfI79wAu3ZBhI7MCbQpI8ZkM9tygmCChIk3/+Pg0l1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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