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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a93ee2b35b5f30116fd2533b21d7436460ad4e9e45955729375e1e406f8abb' 
  AND token = 'mGjd3P9xTuQL+9QqrDY8oHC+MTeTkACKHEErbmcdp6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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