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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38eda752c402346076aca0dc63a73a51bea8e99c62f18ad51c5ebeb0fab306c' 
  AND token = '3QqS6ecZpjxcGhFmCxwdVK2wet1e9ZEf/a13Lhuh8F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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