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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd504156e0f726d1691401acc7cb7e2df4df361e23feb9edbcc56e3e11e30868' 
  AND token = 'KO2gxpz0i99CQGss1N1VeukpTkFBXF+omxoAv5CC68s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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