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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc5a8996f78b44d3fe5bc593507d05284f1622c4acee091ea2f9f8d73feea80' 
  AND token = 'cq1rfAZRUvyD8+wXognVKrb8M7oU4AEf5n+SBCuvniY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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