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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e71d0b04ff6d5e9bb02621c30824bcda0b52ef2d4dcee1ccc227721ea42b0ba' 
  AND token = 'zsztKJ77DnW3QI5jJ20OWR3ed6NOQVtnNRyj6myXNyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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