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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6749691501a43c95b64ad188751863ef2606b953efa479c34bb0420d646a0f' 
  AND token = '0KWfEsQ1lBaGbIN2ojlVjb9pBuPEek65/gRJBgN+48U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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