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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5cd98ed1f667b77fb3ce1246bc8bec493266ef1eb611d4517483483d59347e' 
  AND token = 'vsDx3OMVF+tJzi7rWD5I/wxlJhFNFw9pATbhOslaTLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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