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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cb032dfbd558fe1f05708e73fd26132f3ef3024e187a9c60704b663dd7cbd8' 
  AND token = 'Pc4/o2Yi5iFwo1sU2KwAJ8SW5HHeL3UjaTGYl+Ml3SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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