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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42cb5c86b4214d3d8441e859f32313023c3ff27901a4af70ebcefbed71a0d27' 
  AND token = 'iaCHQZ9YDcpmNQpOMSmMRdqvBHnS1FhvnAhq4mbVYnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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