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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91e0f6f36f6cf97f390b8746ddba50c4c7f9fada86af9850bd6a9dbcc4b6854' 
  AND token = '8cwO/Sng51rk8V519D0ji8m0iKY4gSA/0ez80d02clU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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