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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdeb739ce3c3b50562a7e0884396b8a63f283345d72339f9542775fc4e921cbd' 
  AND token = 'BIjdMLm3zuThsoaS2QvFmzrrEBVh+M4FFiY2B6luT3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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