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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ed1760ab123724f9176ffbec2fffe4c1ebb755fdbe07356168c8b9fc8e80c0' 
  AND token = 'i6z7dhpWOGWklALabZKFJOIT/yAn4tSvS5wNjpxGIRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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