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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556a7aac0fd66a04482fb2c62431f5fd5e72fac2e33e70fd2f9c68d6136614d2' 
  AND token = 'i0cP4U+fXo7Z4imE4umuBHhDanEpVt6bAKJnnsc3Z7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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