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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dc976f4c21c902372a38616a01812e9bd0307834f22a505b29baed21df5605' 
  AND token = 'laLtJtghOjE4J8XOyFMacy7BA3uXmJx4ANC/XqN33I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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