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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864090ebb066df5973640caa87f6b5e27118bb686f61c42f31f87f818df83f36' 
  AND token = 'JVg8sWI3Hh7bW9Ie4SUalD56RhFBPPzYVKmF1kXwsWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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