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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fdcfb8c3f6519f1328d8aa237c36b75e6aa057c36be6416e69d2b22392bcf0' 
  AND token = 'gQq6VBblNudv5NLzfvFaxfv+CAC8EuKxk9oEeq9/NTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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